MackerelAlthough the smell may not be popular with your colleagues this oily fish tastes delicious and is full of healthy fatty acids called omega-3 which are key for re-stimulating brain productivity.

AsparagusSuper-quick to cook, these little spears are big in goodness. They are full of fibre and packed with vitamin C to keep you wide awake.

Spinach Pop-Eye ate these leafy greens for good reason. They provide a plentiful supply of vitamins and minerals that help to fight off colds and calcium that protects your bones.

Chickpeas These pulses are a great alternative to meat as a source of protein to restore your cells. Practically fat free these taste great in any salad or soup and their high-fibre content will be sure to keep you feeling full until the end of the day.